Blogs | Freeform Polymers

Injection Molding Limitations: What They Mean for Your Part Design

Justin Brown July 9, 2026 No Comments

Injection molding is precise and repeatable. But it still has real limits on size, design, tooling, and time. At Freeform Polymers, we know plastic molding works within the size of…

Design Considerations for Plastic Molding: A Practical Guide Before You Send Your Part to a Molder

Justin Brown July 9, 2026 No Comments

Design mistakes are one of the most common reasons a first mold sample gets rejected. A part looks perfect on screen. Then the sample comes back warped, or a thin…

What Are the Raw Materials for Plastic Injection Molding? A Simple Guide to Resins, Additives, and Fillers

Justin Brown July 2, 2026 No Comments

Before hot plastic fills a mold, it starts small and simple. It begins as tiny pellets, about the size of rice. So what are those pellets made of? And what…

What Plastic Cannot Be Molded? Material and Design Limits Explained

Justin Brown July 2, 2026 No Comments

Not every plastic can go through an injection molding machine. Not every part shape can, either. You might have a design ready and a plastic in mind. Then a shop…

How Thin Can You Injection Mold Plastic? Minimum Wall Thickness, Explained

Justin Brown June 25, 2026 No Comments

Most plastic parts are molded with walls between 2 and 4 millimeters. With the right setup, thin-wall molding can push under 1 millimeter. So how thin can you really go…

Can You Make Your Own Injection-Molded Plastic Parts? An Honest Look at DIY

Justin Brown June 25, 2026 No Comments

You sketched a part. Now you want to know if you can just make it yourself. The short answer is yes, sort of. People do mold their own plastic parts…

What Is 3K Injection Molding? How Three-Material Parts Are Made

Justin Brown June 18, 2026 No Comments

Ever wonder how one button can feel hard on the outside but soft where you grip it? The symbol might even be a different color. No glue holds these parts…

What Is 2K Injection Molding? How Two-Shot Molding Works

Justin Brown June 18, 2026 No Comments

Ever wonder how a toothbrush gets a hard handle and a soft grip in one piece? There is no glue holding the two parts together. The answer is two plastics,…